public class Example4_10 {
 public static void main(String args[]) {
   Lader.下底=100;
   Lader laderOne = new Lader();
   Lader laderTwo = new Lader();
   laderOne.设置上底(28);
   laderTwo.设置上底(66);
   System.out.println("laderOne的上底："+laderOne.获取上底());
   System.out.println("laderOne的下底："+laderOne.获取下底());
   System.out.println("laderTwo的上底："+laderTwo.获取上底());
   System.out.println("laderTwo的下底："+laderTwo.获取下底());
 }
}

